problem with configuring dhcpd for 'unknown' networks

Glenn Satchell glenn.satchell at
Thu Feb 21 01:13:32 UTC 2019

Hi Boris,

The dhcp relay *only* relays broadcast requests from a local subnet to the
dhcp server. All other unicast traffic, eg ack, renew, etc, messages must
be able to route to the IP address of the dhcp service.

So make sure you can, for example, ping the dhcp IP address from a device
on the network where your dhcp clients will be. I'm thinking the /32
address is not looking like it is routable to the dhcp server when it


On Thu, February 21, 2019 9:27 am, Boris Behrens wrote:
> On Wed, Feb 20, 2019 at 10:47 PM Simon Hobson <dhcp1 at>
> wrote:
>> You can - provided you have a relay agent on the client network.
>> The server must have an IP address in it's own network(s), and there
>> must be IP routing between client networks and server, and you need a
>> subnet declaration for each served network. There is no requirement for
>> teh DHCP server to have an interface in every network it serves.
>> Yes, but I get another error with "unknow interface type 65565" when I
>> use
> the default virtual ethernet from openvz. I need an bridge interface to
> bind it, BUT this interface does not need to be connected and it doesn't
> even need a usable ip address.
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